Operating manual ALPHASEAPILOT MFC Issue 1.1 Page 55 of 84
ALPHASEAPILOT MFC
2.26 STW Speed Data Input (Speed through the Water)
It is essential to note that Speed through the water (STW) input data is the primary
requirement for the Autopilot Speed Adaptive operating mode.
In the absence of STW data – Speed Adaptive operation is not possible and any attempt to
calibrate (section 2.29) or engage the Adaptive mode will be rejected and accompanied by an
audible alarm and display message NO STW DATA.
2.27 SOG Speed Data Input (Speed over the Ground)
It is essential to note that Speed over the Ground (SOG) input data is the primary requirement
for Autopilot RADIUS of TURN control when operating in a stand alone mode.
(When operating in the Track Control Mode based on complex $HTC data received from an
Approved Track Control System, all necessary parameters – including SOG – will be available
from the $HTC sentence). In the event that SOG data is absent, or fails, an audible alarm and
display – NO SOG DATA – will be displayed.
If SOG data is present but the SOG is too slow to sustain the specified RADIUS of TURN,
audible and visual alarms will result – SPEED LOW.
2.28 Draft Input (Laden State)
Draft Input data is an Adaptive operating mode parameter but its absence will not prevent
Adaptive Autopilot calibration and operation provided STW Speed input data is available.
However, if draft Input data was present in previous/original Adaptive calibration procedures,
it’s subsequent absence or failure will generate an audible alarm and display message ‘DRAFT
IN FAIL’.
Ongoing Speed Adaptive operation will still be possible but the audible alarm will persist
until/unless Draft data is restored or the audible alarm is muted by 5 second operation of the
TEST/OFF key.
NB. If the alarm is muted in this manner – ALL audible alarms will be muted.
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